My friends at the Press Association carry an article that outlines how Tom and Jerry cartoons are to be edited to remove scenes in which the characters smoke.
My solution would be somewhat different. I would embellish the scenes, building up to a series in which Tom smokes at length, and develops lung cancer. The pictures could show his body slowly wasting away, while his hair falls out, his eyes glaze over and his knob drops off. He would be unable to chase Jerry for more than 10 yards before pausing for a lengthy wheeze. In my version, however, Tom would have the last (somewhat painful) laugh, as Jerry, so convulsed with hilarity at Tom’s predicament, would be rendered helpless, and captured by scientists. He would spend the remainder of his days in a small cage, forced to smoke Benson and Hedges, as his captors search for a cure for cancer.